d) To change 120 mm to kilometers, fi nd mm on the metric conversion chart. Move six places to the left to get to km. m or 0.001 m 1 1000 m or 0.01 m 1 100 m or 0.1 m 1 10 1000 m 100 m 10 m 1 m km hm dam m dm End here. cm mm Start here. Move six places to the left. Put a decimal point at the end of the number 120. When you move the decimal point six places to the left, you must put in zeros as placeholders. 120. m 000120 km Put in zeros as placeholders. Put the decimal point at Move the decimal point six places the end of the number. to the left. So, 120 m 0.000120 km or 0.00012 km. YOU TRY 4 Convert each measurement to the indicated unit. a) 72.9 cm to meters b) 3.881 m to centimeters c) 645 cm to kilometers d) 2 m to millimeters ANSWERS TO YOU TRY EXERCISES 1) a) m b) cm c) km d) mm 2) a) 53 mm b) 5.3 cm 3) a) 9.62 m b) 8300 mm c) 0.174 m 4) a) 0.729 m b) 388.1 cm c) 0.00645 km d) 2000 mm 7.2 Exercises Do the exercises, and check your work. Objective 1: Learn the Basic Units of Length Use the meaning of metric prefi xes to fi ll in the blanks. 1) milli means so 2) deci means so 1 mm m 1 dm m 3) kilo means so 4) hecto means so 1 km m 1 hm m 5) centi means so 6) deka means so 1 cm m 1 dam m Use the ruler to fi nd the measurements in Exercises 7–14. 0 cm 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 7) The length of a dollar bill, a) in centimeters. b) in millimeters. 8) The width of a dollar bill, a) in centimeters. b) in millimeters. 9) The diameter of a quarter, a) in millimeters. b) in centimeters. 10) The diameter of a nickel, a) in millimeters. b) in centimeters. 452 CHAPTER 7 Measurement and Conversion www.mhhe.com/messersmith
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